Patent · US Expired

Low beam or fog headlamp for motor vehicles

US4796171A · kind A · utility

21Cited by

4References

19Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Gerhard Lindae · Leonberg, DE
Richard Loewe · Gerlingen, DE
Peter Perthus · Stuttgart, DE

Key dates

Filing date	Nov 3, 1986
Grant date	Jan 3, 1989
Priority date	—
Expiry date	Nov 3, 2006

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF21S41/275
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A low beam headlamp for motor vehicles includes an objective made of pressed glass whose one side is formed as aspheric partial surfaces of identical or different aspherity. The partial surfaces are staggered in the direction parallel to the optical axis of the objective and the resulting step has rounded edges. The aspheric partial surfaces adjust light distribution to achieve a desired quality of the light-dark boundary zone projected on the driveway, and provide corrected color fringes of the passing light beam.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.